Crossword Genius

Red gemstone (4)

Ross

I believe the answer is:

ruby

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">red gemstone</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for ruby that I've seen before include "Deep 6 across" , "Deep red variety of corundum" , "Stony girl" , "Completely" , "Gemstone - shade of red" .)

I've seen this clue in The Times, The New York Times, The Sun, The Independent, the Sydney Morning Herald, The Telegraph and the LA Times.
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